Artificial tooth.



R. F. ROBB.

ARTIFICIAL TOOTH.

APPucATmN FILED FEB. 28. 191s.

Patented Sept. 18, 1917.

ROBERT FINLAY ROBB, or GLASGOW,

scoTnANn.

ARTIFICIAL TOOTI-I.

Specication of Letters Patent.

Patented Sept. 18, 1917.

Application filed February 28, 1916. Serial No. 80,915.

To all whom t may concern.:

Be it known that I, ROBERT FINLAY ROBE, of 125 Great Nestern Road, Glasgow, Scotland, dentist, have invented certain new useful Improvements in or Relating to Artiiicial Teeth, of which the following is a specification.

My invention relates to improvements in dentistry and has for its Object to simplify the fixing of the teeth to the plate without the use of platinum wire, and thereby reducing the cost of the same, and refers to that class in which there is cut in rear or back wall at the back of the tooth a longitudinal slot or slots adapted to receive the vulcanite forming the plate and in which there is carried a metal attachment of aluminum or other suitable metal which the acids of the mouth will not touch, the slots and middle attachment being so formed as to dovetail one within the other, thus the pins grip the tooth and the cross-bar is attached to the plate.

In order that my invention may be properly understood and readily carried into effect, I have hereunto appended one sheet of drawings, of which- Figure lis an elevation of the back of an artificial tooth detached designed for the upper jaw embodying my invention.

Fig. 2is a side view of the same with a part of the denture plate in section.

Fig. 3 is a plan also of Fig. 1, looking from front to back.

Fig. 1 is a horizontal section of Fig. 2 taken on the line a, b.

Fig. 5 is a plan of the aluminum or other metallic pin or attachment device detached.

Fig. 6 is a view corresponding to Fig. 1 of an artificial tooth designed for the lower jaw and embodying my invention.

Fig. 7 is a side view corresponding to Fig. 2. f

Fig. 8 is a plan of the same corresponding to Fig. 3.

Fig. 9 is a horizontal section corresponding to Fig. 4c taken on the line c, CZ, of Fig. 7.

Fig. 10 is a plan of the attachment device corresponding to Fig. 5, and A Fig. 11 is an end view of same, all of the aforesaid figures are drawn-to an enlarged scale and all hereafter more fully referred to and described.

With reference to Figs. 1 to 5 inclusive of the drawings which appertain to the upper denture plate, and although the tooth an d illustrated in these figures 'is the incisor tooth, it is here explained that my improvements apply equally to a canine or molar tooth or any number of teeth composing a complete set. I cut in the rear of back wall of the tooth a deep incision to the extent of half its depth, which operation leaves a well defined shoulder or recess to receive a considerable bed of vulcanite. In the rear wall as formed by said incision, I cut two vertical parallel grooves or dovetail recesses A and B within the back wall or lingual side thereof, and above the shoulder C of the tooth D, extending in a right angular direction as shown at A2. These grooves or dovetail recesses aforesaid are designed to receive corresponding dovetail projections E forming a part of the metallic attachment, and the remaining space to be filled up by the vulcanite. The said metallic attachment in one of its forms consists of the said projections E, the two arms F, G, and cross-bar I-I. In the intimate adherence of the vulcanite I or the like to the tooth, the metallic attachment is placed approximately in the position shown in Fig. 2, and portions of the vulcanite I or the like are pressed into the dovetail recess above and below the projections E and so perfectly interlock the elements together, even with the usual shrinkage of the vulcanite.

Referring to Figs. 6 to 11 inclusive of the drawings which illustrate the application of the improvements to the lower plate of the mouth, the tooth there shown is of a similar type to that illustrated in the preceding figures, and though shown in the same position it would in practice be inverted, in which instance a single vertical groove Or dovetail recess A1 is cut within the back wall and eX- tending in a right angular direction at the shoulder as at A2. Into the vertical portion of this groove or recess is inserted the dovetail projection E1 of the metallic attachment which, in its simplest form, consists of a dovetail formed On both of its sides as seen in Fig. 11 and of the arm F1, and a short transverse piece H1, projecting on either side of the aforesaid arm. In like manner to the method employed corresponding to Figs. 1 to A, the vulcanite is pressed into the recess A1, above and below the dovetail projection E1 and the arm F1 and bar H1, and the whole completely enveloped as seen in Fig. 7.

Claims:

1. The combination with an artificial of, Vand. a locking bar adapted to be seated in a bed of vulcanite or like material, said looking bar having aplurality of pro]eo tions for engaging in said grooves.

In Witness whereof I afIiX iny signature in presence of two witnesses.

ROBERT FINLAY ROBE;l

Witnesses:

JOHN LiDDLifi, JOHN TRAIN LIDDLE.

Copies of this patent may be obtained 4for ve cents each, `by addressing the Commissioner of Patents,-

Washington, D. C. 

